Postscript

Just in from race organizers:

AN IMPORTANT UPDATE SO YOU ARE INFORMED!: We just learned from
Harriman State Park that the Lake Welch water has failed to pass the
water testing. This is mostly due to run-off from recent rain
showers. They are diligently testing today and will do the same
tomorrow. We are hoping as the rain slows down we will see
improvement in the water quality and it will pass the test. If the
water does not pass the test by Saturday Morning we will still have
the races but we will replace the swim portion with a run (1Mile for
Half, .75 for Olympic). Thank you for you understanding as this is
out of our hands at this point.

That's fine, if there's no swim it's not quite such a good training day but I am not fretting about it either way, I've done quite a few triathlons and open-water swim races by now and it is not where I so much need the practice...